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Review of Curt Trailer Hitch Ball - 2-5/16 Inch 30K Hitch Ball - C40085

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Curt Trailer Hitch Ball - 2-5/16 Inch 30K Hitch Ball - C40085 Review

Ellen: Hey, everyone. I'm Ellen here at, and we're going to be taking a quick look at the CURT hitch ball. This allows you to be able to connect to your trailer with a proper size ball and put it onto maybe, a new ball mount. And maybe you need it to drop, or something else. So, this is going to replace either, a worn out ball on your ball mount, or just allow you to make a new one to fit your trailer application. So let's make sure that this is the right fit for your particular ball mount.It's a two and 5/16-inch ball, so that should work with your two and 5/16th-inch coupler.

The shank diameter is one and a quarter inch, and then the length of the shank is listed at two and five eighths. Although, whenever we measure it here at etrailer, we always measure from the very bottom of the lip here, that would be resting on top of that ball platform to the very end of the shank. And if you measure like that, it actually measures about two and three quarters. So I'll show you that in just a minute, but I just want to let you know.For some reason, CURT lists it as two and five eighths. It's not a huge difference, but it is an eighth of an inch so, sometimes that can make all the difference.

As you can see, pretty much right at two and three quarters of an inch. But, it's listed at two and five eighths, so. Just want to let you know that it does come with the lock washer and nut. You want to make sure that you tighten that down to the torque specs that are supplied with the ball whenever you get this, to make sure that it's seated on there properly, and that you don't have any issues.It's made out of nice heat-treated steel with a raw machine finish, so there's kind of a texture to it that should give you a really nice heavy-duty look and feel over time. Shouldn't have any issues with corrosion, or anything like that.

The threads on our shank are nice and fine, so it should give a really tight grip to make sure that this doesn't go anywhere as you're towing. As far as the other specs, this should fit any kind of ball platform that's between three eighths of an inch to an inch thick. The overall height of the ball is right at five and three quarters of an inch tall.See it a little bit better there. The capacity that this can handle is 30,000 pounds. You want to be sure though, that you're going off of the lowest number between any component in your system.

That includes the ball platform, your hitch, the coupler, and anything else in between. And, also your towing vehicle that you're working with. So, always go off of the lowest number of any of your component. The nut on the end here requires a one and seven eighths-inch socket or wrench.This is covered by a one-year limited warranty. And, you want to make sure that the hole size on your ball mount is not any more than 1/16th of an inch larger in diameter than this threaded shank. So, this is one and a quarter. You want to make sure that you don't go over one and 5/16ths. There's a lot of ball platforms available, or ball mounts here at if you don't already have one, so you can find a lot of options. Hope this has been helpful in figuring out if this is the right ball mount for you, or the right hitch ball for you. Thanks for watching.

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Info for this part was:

Employee Kathleen M
Installed by:
Kathleen M
Employee Adam E
Installed by:
Adam E
Employee Chris R
Video Edited:
Chris R

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